Considering language use in the text, it’s correct to say...

UNEB - Inglês - 2018 - Vestibular - Português/Inglês/Ciências humanas

A) The possessive adjective “their” (l. 2) refers to “Fitness trackers” (l. 1)

B) The expression “so far” (l. 3) is synonymous with up till now.

C) The verb form “asked” (l. 7) is in the past tense.

D) The conjunction phrase “either [...] or” (l. 7-9) expresses condition.

E) The modal “may” (l. 15) expresses necessity.